Comment by salamo

I’m working on an iOS app, One Million Checkmates [1]. It scratches an itch I had of chess puzzles for a long plane ride. This app has a functionally unlimited number of puzzles, all offline.

There was a decent amount of work involved in getting the download size reasonable since we need to store all valid moves in a position. There are puzzles with over 40 million valid move sequences, so I had to aggressively prune and compress the move trees.

[1] https://apps.apple.com/us/app/one-million-checkmates/id67625...